Alert archive / Louisiana / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 21, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Jan 22, 1999, 5:55 PM CST for Lafourche Parish, Terrebonne Parish, Louisiana. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jan 22, 1999, 5:55 PM CST (23:55 UTC)
- Expired
- Jan 22, 1999, 6:25 PM CST
- In force
- 30 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
Counties Lafourche Parish, LA, Terrebonne Parish, LA
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 22, 3:00 PM CST | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 11.9 hours before the alert went out and 128 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1281 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 515 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 386 m²/s²
- 0-3 km storm-relative helicity
- 445 m²/s²
- Significant tornado parameter
- 2.4
- Supercell composite
- 12.2
The text
As transmitted, in the capitals the NWS used until 2016.
999 WUUS1 KNEW 222352 RRA SVRNEW LAC057-109-230025- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE NEW ORLEANS LA 555 PM CST FRI JAN 22 1999 THE NATIONAL WEATHER SERVICE IN NEW ORLEANS LA HAS ISSUED A... * SEVERE THUNDERSTORM WARNING FOR - TERREBONNE PARISH IN SOUTHEASTERN LOUISIANA - NORTHERN LAFOURCHE PARISH IN SOUTHEASTERN LOUISIANA * UNTIL 625 PM CST * AT 553 PM CST... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM SOUTHWEST OF GIBSON IN NORTHERN TERREBONE PARISH AND ANOTHER SEVERE THUNDERSTORM ALONG THE SOUTHWEST TERREBONE PARISH COAST. THESE STORMS WILL LIKELY PRODUCE LARGE HAIL AS THEY MOVE TO THE NORTHEAST AT 45 MPH. * THE SEVERE THUNDERSTORMS WILL AFFECT AREAS AROUND THIBODAUX. A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. REMAIN CALM BUT BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 22, 2:50 PM CST | Severe Thunderstorm Warning | LIX | West Feliciana | 30 min |
| Jan 22, 3:33 PM CST | Severe Thunderstorm Warning | LIX | Iberville | 32 min |
| Jan 22, 3:51 PM CST | Severe Thunderstorm Warning | LIX | East Baton Rouge, West Baton Rouge | 49 min |
| Jan 22, 4:05 PM CST | Severe Thunderstorm Warning | LIX | East Feliciana, Livingston, Saint Helena | 35 min |
| Jan 22, 4:40 PM CST | Severe Thunderstorm Warning | LIX | Saint Helena, Tangipahoa | 45 min |
| Jan 22, 5:33 PM CST | Severe Thunderstorm Warning | LIX | Ascension, Assumption, Saint James | 42 min |
| Jan 22, 5:46 PM CST | Severe Thunderstorm Warning | LIX | Livingston | 34 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 1999Every severe thunderstorm warning in 1999
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.